Nothing irritates me.   Except this:

I've got a Sanef Liber-t tag in my car which lets me use the French autoroutes without having to stop and pay at the tollbooths. Sanef collect the charges from my bank account on behalf of all the other autoroute operators. So far, so great.

Sanef also operate the Dartford crossing over the Thames estuary outside London. But can I use the tag for this? No, of course not. Or 'not yet' (but they've been saying that for ages). Now, if I'm crossing over to the wilds of East Anglia it means I'm away from home, away from my computer, and I'm too Neanderthal to have a smart phone, so I've got no simple way of paying up and avoiding a fine. So basically I don't go there.